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200 lines
6.4 KiB
200 lines
6.4 KiB
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#include STM32_HAL_H
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#include TREZOR_BOARD
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#include "i2c.h"
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#include "common.h"
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static I2C_HandleTypeDef i2c_handle[I2C_COUNT];
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typedef struct {
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I2C_TypeDef *Instance;
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GPIO_TypeDef *SclPort;
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GPIO_TypeDef *SdaPort;
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uint16_t SclPin;
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uint16_t SdaPin;
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uint8_t PinAF;
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uint32_t Reset;
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} i2c_instance_t;
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i2c_instance_t i2c_defs[I2C_COUNT] = {
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{
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.Instance = I2C_INSTANCE_0,
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.SclPort = I2C_INSTANCE_0_SCL_PORT,
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.SdaPort = I2C_INSTANCE_0_SDA_PORT,
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.SclPin = I2C_INSTANCE_0_SCL_PIN,
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.SdaPin = I2C_INSTANCE_0_SDA_PIN,
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.PinAF = I2C_INSTANCE_0_PIN_AF,
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.Reset = I2C_INSTANCE_0_RESET_FLG,
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},
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#ifdef I2C_INSTANCE_1
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{
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.Instance = I2C_INSTANCE_1,
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.SclPort = I2C_INSTANCE_1_SCL_PORT,
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.SdaPort = I2C_INSTANCE_1_SDA_PORT,
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.SclPin = I2C_INSTANCE_1_SCL_PIN,
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.SdaPin = I2C_INSTANCE_1_SDA_PIN,
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.PinAF = I2C_INSTANCE_1_PIN_AF,
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.Reset = I2C_INSTANCE_1_RESET_FLG,
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},
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#endif
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};
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void i2c_init_instance(uint16_t idx, i2c_instance_t *instance) {
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if (i2c_handle[idx].Instance) {
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return;
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}
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GPIO_InitTypeDef GPIO_InitStructure;
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// configure CTP I2C SCL and SDA GPIO lines
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GPIO_InitStructure.Mode = GPIO_MODE_AF_OD;
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GPIO_InitStructure.Pull = GPIO_NOPULL;
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GPIO_InitStructure.Speed =
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GPIO_SPEED_FREQ_LOW; // I2C is a KHz bus and low speed is still good into
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// the low MHz
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GPIO_InitStructure.Alternate = instance->PinAF;
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GPIO_InitStructure.Pin = instance->SclPin;
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HAL_GPIO_Init(instance->SclPort, &GPIO_InitStructure);
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GPIO_InitStructure.Alternate = instance->PinAF;
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GPIO_InitStructure.Pin = instance->SdaPin;
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HAL_GPIO_Init(instance->SdaPort, &GPIO_InitStructure);
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i2c_handle[idx].Instance = instance->Instance;
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i2c_handle[idx].Init.ClockSpeed = 200000;
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i2c_handle[idx].Init.DutyCycle = I2C_DUTYCYCLE_16_9;
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i2c_handle[idx].Init.OwnAddress1 = 0xFE; // master
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i2c_handle[idx].Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
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i2c_handle[idx].Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
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i2c_handle[idx].Init.OwnAddress2 = 0;
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i2c_handle[idx].Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
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i2c_handle[idx].Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
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if (HAL_OK != HAL_I2C_Init(&i2c_handle[idx])) {
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ensure(secfalse, "I2C was not loaded properly.");
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return;
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}
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}
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void i2c_init(void) {
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// enable I2C clock
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I2C_INSTANCE_0_CLK_EN();
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I2C_INSTANCE_0_SCL_CLK_EN();
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I2C_INSTANCE_0_SDA_CLK_EN();
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i2c_init_instance(0, &i2c_defs[0]);
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#ifdef I2C_INSTANCE_1
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I2C_INSTANCE_1_CLK_EN();
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I2C_INSTANCE_1_SCL_CLK_EN();
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I2C_INSTANCE_1_SDA_CLK_EN();
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i2c_init_instance(1, &i2c_defs[1]);
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#endif
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}
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void i2c_deinit(uint16_t idx) {
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if (i2c_handle[idx].Instance) {
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HAL_I2C_DeInit(&i2c_handle[idx]);
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i2c_handle[idx].Instance = NULL;
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}
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}
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void i2c_ensure_pin(GPIO_TypeDef *port, uint16_t GPIO_Pin,
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GPIO_PinState PinState) {
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HAL_GPIO_WritePin(port, GPIO_Pin, PinState);
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while (HAL_GPIO_ReadPin(port, GPIO_Pin) != PinState)
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;
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}
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// I2C cycle described in section 2.9.7 of STM CD00288116 Errata sheet
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//
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// https://www.st.com/content/ccc/resource/technical/document/errata_sheet/7f/05/b0/bc/34/2f/4c/21/CD00288116.pdf/files/CD00288116.pdf/jcr:content/translations/en.CD00288116.pdf
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void i2c_cycle(uint16_t idx) {
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i2c_instance_t *instance = &i2c_defs[0];
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// 1. Disable I2C peripheral
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i2c_deinit(idx);
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// 2. Configure SCL/SDA as GPIO OUTPUT Open Drain
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GPIO_InitTypeDef GPIO_InitStructure;
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GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_OD;
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GPIO_InitStructure.Pull = GPIO_NOPULL;
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GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_LOW;
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GPIO_InitStructure.Pin = instance->SdaPin;
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HAL_GPIO_Init(instance->SdaPort, &GPIO_InitStructure);
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GPIO_InitStructure.Pin = instance->SclPin;
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HAL_GPIO_Init(instance->SclPort, &GPIO_InitStructure);
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HAL_Delay(50);
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// 3. Check SCL and SDA High level
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i2c_ensure_pin(instance->SclPort, instance->SclPin, GPIO_PIN_SET);
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i2c_ensure_pin(instance->SdaPort, instance->SdaPin, GPIO_PIN_SET);
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// 4+5. Check SDA Low level
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i2c_ensure_pin(instance->SdaPort, instance->SdaPin, GPIO_PIN_RESET);
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// 6+7. Check SCL Low level
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i2c_ensure_pin(instance->SclPort, instance->SclPin, GPIO_PIN_RESET);
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// 8+9. Check SCL High level
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i2c_ensure_pin(instance->SclPort, instance->SclPin, GPIO_PIN_SET);
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// 10+11. Check SDA High level
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i2c_ensure_pin(instance->SclPort, instance->SdaPin, GPIO_PIN_SET);
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// 12. Configure SCL/SDA as Alternate function Open-Drain
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GPIO_InitStructure.Mode = GPIO_MODE_AF_OD;
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GPIO_InitStructure.Pull = GPIO_NOPULL;
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GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_LOW;
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GPIO_InitStructure.Alternate = instance->PinAF;
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GPIO_InitStructure.Pin = instance->SclPin;
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HAL_GPIO_Init(instance->SclPort, &GPIO_InitStructure);
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GPIO_InitStructure.Pin = instance->SdaPin;
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HAL_GPIO_Init(instance->SdaPort, &GPIO_InitStructure);
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HAL_Delay(50);
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// 13. Force reset
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RCC->APB1RSTR |= instance->Reset;
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HAL_Delay(50);
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// 14. Release reset
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RCC->APB1RSTR &= ~instance->Reset;
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// 15. Enable the I2C peripheral
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i2c_init_instance(idx, instance);
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HAL_Delay(10);
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}
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HAL_StatusTypeDef i2c_transmit(uint16_t idx, uint8_t addr, uint8_t *data,
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uint16_t len, uint32_t timeout) {
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return HAL_I2C_Master_Transmit(&i2c_handle[idx], addr, data, len, timeout);
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}
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HAL_StatusTypeDef i2c_receive(uint16_t idx, uint8_t addr, uint8_t *data,
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uint16_t len, uint32_t timeout) {
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HAL_StatusTypeDef ret =
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HAL_I2C_Master_Receive(&i2c_handle[idx], addr, data, len, timeout);
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#ifdef USE_OPTIGA
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if (idx == OPTIGA_I2C_INSTANCE) {
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// apply GUARD_TIME as specified by the OPTIGA datasheet
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// (only applies to the I2C bus to which the OPTIGA is connected)
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hal_delay_us(50);
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}
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#endif
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return ret;
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}
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HAL_StatusTypeDef i2c_mem_write(uint16_t idx, uint8_t addr, uint16_t mem_addr,
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uint16_t mem_addr_size, uint8_t *data,
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uint16_t len, uint32_t timeout) {
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return HAL_I2C_Mem_Write(&i2c_handle[idx], addr, mem_addr, mem_addr_size,
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data, len, timeout);
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}
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HAL_StatusTypeDef i2c_mem_read(uint16_t idx, uint8_t addr, uint16_t mem_addr,
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uint16_t mem_addr_size, uint8_t *data,
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uint16_t len, uint32_t timeout) {
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return HAL_I2C_Mem_Read(&i2c_handle[idx], addr, mem_addr, mem_addr_size, data,
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len, timeout);
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}
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